Method of forming metallic barrel-bodies.



i t L. BAUROTH. 7

METHOD OF FORMING METALLIC BARREL BODIES.

APPLICATION FILED NOV. 27. 1911.

Patented Oct. 1, 1912.

3 SHEETS-SHEET 'l.

.NN. gt RN t N Lrm i L BAUROTH METHOD OF FORMING METALLIC BARREL BODIES.

APPLICATION FILED NOV. 27. 1911.

Mtented 001;. 1, 1912 3 SHEETSSHEET 2 L. BAUR'OTH. METHOD OF FORMING METALLIC BARREL BODIES.

APPLICATION FILED N0v.27;1911.

Patented Oct. 1, 1912 3 SHEETSSHEET 3.

llllmmmum IIIIIHIIHIH mum i QM

Jummu cor? UNITED STATES Par FFICE.

LEONHARD BAUROTH, OF TOLEDO, OHIO, ASSIGNOB- Ti) CHARLES H. WACKER, OF

CHICAGO, ILLINOIS. I

METHOD OF FORMING METALLIC BARREL-BODIES.

b all whom it may concern:

Be it known that I, LEONUARD BAUuo'rn, a citizen of the United States, residing at Toledo, in the county of Lucas and State of Ghio, have invented a certain new and useful Method of Forming Metallic Barrel-Bodies, of which the following is a specification.

My invention consists in a new and useful method of making of forming the bodies of metallic barrels of bilge form; and speaking in general terms my method consists in taking a cylindrical blank of proper diameter and length, according to the size of the barrel body desired, and of suitable ma terial, such as sheet steel and, after placing.

My present invention{relates to the method or process of forming bil d metal barrel bodies and is irrespective 0 any particular apparatus, inasmuch any suitable apparatus capable of practising or carrying out said method may be employed.

For the purpose of a clear and definite disclosure of m invention -have chosen to illustrate and will hereinafter describe certain. apparatus which I havefound in practies to be suitable for the purpose but it will be understood that my method is independout of apparatus and is not to be limited in any way to the apparatus shown or any other character of apparatus. Moreover, I make no claim herein for said apparatus.

Referring to the accompanying drawings illustrating two forms of apparatus which may be used to carry out my method, Figure l is a plan view of one form thereof; Fig. 2 a sectional elevation on the line 2-2 of- Fig. 1; Fig. 3 a similar view of the parts but shown in a different position; Fig. i a cross section on the line 4.'4= of Fig. 2;

Fig. 5 a cross section on the line 5--5 of Specification of Letters Iatcnt.

Application filed November 27, 1911.

ljatented Oct. 1, 1912.

Serial No. 662,609.

Fig. 3; Fig. (3 a plan view of another form of apparatus and Figs. 7 and 8 detail views of the exp-antlers in different positions.

Referring to the particular apparatus shown in F l to 5 explaining the character oat my method during the description of such apparatus, the main frame or base 1 of the machine has at its opposite ends the standards or end frames 2, between which extend tie rods 3. In this particular machine a hollow die is used within which the cylindrical blanks are received and then expanded, such die consisting of a body portion a provided with flanges or projections 5 which are secured. to one of the beams 1. The die is provided with a longitudinal bore having at each end a cylindrical portion is and a bilged barrel-shaped intermediate portion l This latter portion or section is provided with a suitable number of air holes .6 to permitthe escape of air trapped be tween the cylindrical blank indicated at- 7 and, the inner surface of the die and the latter is further provided atior near its center with a shallow groove 4? when it is desired to introduce a strengthening rib within the barrel. The intermediate portion or section of the die is divided longitudinally along a horizontal plane into halves, the

lower of which is int-c ral. with the end sections and the upper of which is hinged thereto as at 8, 1, for the purpose of permitting the ready insertion of the cylindrical blanks and the removal of the same after 'tl'iey have been expanded. The hinge portion of the die is provided with peritorated ears 9 which receive and turn upon a hinged bolt or pintlelO, said bolt being received in the perforated portions of the, parts 8 above referred to.

will act upon the lugs 11 forcing them downwardly thereby holding the hinged member closed.

blanks consists, in the present instance, of

' two similar expansible heads which are mov-' able towardand away from'ea'ch other-within the hollow die and are carried by; slides 15 reciprocating within the cylindrical ends Each of these slides is connected with a screw 16 by which it is reciprocated and which-in turn is fed or operated by any suitable mechanism to be hereinafter described. :The inner end of each screw is connected in suitable manner to its slide", the

latter for convenience of assembling being formed in halves separated from each other along a diametrical plane and secured to gether by bolts 17. Each expanding head consists of a central portion or support 18 and a number of laterally movable sections. The support 18 is provided with a stem'19 anda flange 20, the same being received by the inner end of its slide. The laterally movable sections are in two series, there'being a plurality of outer die which engage the blank and'a plurality of intermedi e die members-22 which directly support the outer die mcmbers and which also in the final expanding operat on engage shaped that when the contracted they form a practically continuthe blank. The central support is in the present instance a prism hexagonal in cross section as mdlcated 1n Fig. 5, and to each of [its faces is pivoted one of these intermediate members 92 by parallel motion links 23, here shown as three in number. The support and intermediate members are suitably recessed, as shown, to accommodate the links when such intermediate members are in contact with thesupport, said members themselves being substantially hexagonal prisms 'so expanding head is ous body around the central suppor't, but their adjacent out-er faces lie in planes which together form reentrant angles. It is within these angles that the outer die members 21 rest andyslideythe members of the?two sets or series being connected together by a tonue and groove connection indicated at 24;, igs. 4 and ,5, which may be of any ordinary or desired form; the tongues and central members.

heads. are thrust inwardly, the ends of the,

grooves, however, extending transversely of the faces ofthemembers. As indicated in Fig. 3, when the expanding heads are contracted the members of the two movable series-project beyond the inner ends of the When, however, l these laterally movable members first meet and as the supports continue to approach: each other, the"'sets of intermediate members of the two heads mutually force'each other out- ,Wardly on their linked connections andthe outer die members slide with relation to the members 21 intermediate members and separate to acv I commodate the outward movement of the The means for expanding the cylindrical latter. When theexpansion has been com,- pleted the supporting members are in con tact at their ends or substantially so, and,

both the members 21 and 22 are In contact with the inner surface of the barrel blank, I

"so shaped or tapered longitudinally that the first expanding action will cause the extreme inner ends of the die members to initially engage-the interior of the barrel blank A midway of its length and to then apply the pressure progressively outwardly toward opposite ends. Consequently the first action upon the barrel blank is a gripping thereof at its central portion so that it is firmly and positively centered with respect to the die and the subsequent action is the application of further pressure at'such central portion and of pressure applied progressively and outwardly toward the opposite ends with the result that the barrels are perfectly and uniformly formed and are undistorted. Moreover, the blank is expanded to proper barrel form in a uniform manner and without regard to any difference in the strength of steel in the cylinder at different points thereof."

As hereinbeforc stated any suitable means may be emploved for driving the screws 16. Inthe present instance these screws are driven from a power shaft 25 having at its opposite ends pinions 26 which in turn mesh with large gear wheels 27 which are suitably journaled .on the end frames and centrally threaded to receive the screws 16. The driving shaft is provided with oppositelyyrotating pulley.- 98 and. 29 one or the oth r of which is placed in action by means of the clutch 30 controlled by the shifter rod 31. As herein shown and in practice I prefer to employ an automatic device for shifting the clutch when the expander heads reach their extreme positions, but as this automatic mechanism is immaterial to my method, the same need not be herein described.

In Figs. 6,-7, and 8 I have illustrated another apparatus capable of practising "my method or process. As shown; this apparatus or machine is provided with end frames or standards 32 rigidly connected by tie rods 33. A main shaft 34 is journaled at its: ends in said standards and provided. 'near its'ends with two similar cam drums 35 which are adapted to operate two plungers 36 and cause them to be moved toward and away from each other. Each plunger intermediate its length is provided withcam "rollers 37 and-38, against which bears the rib portion 35 of a cam drum, such drum being so formed that in one rotation the plunger will make a full cycle of reciprocation. These plungers are adapted to reciprocate in the main frame or bed 39 of the machine, a portion of which is cut away at 39 in order to provide a space for the central. support by means of links 42 similar to the links of the other described construction, but here shown as of a lesser number. Likewise, the die members are decreased in cross-section from their outer-to their inner ends, for the same reason as in the case of the die members of the other machine. Surrounding each expanding head, when in collapsed or retracted position, is a work holder 43 which is in the general form of a hollow cylinder with an outer socketed portion 43 adapted to receive its end of the barrel blank A. The other or inner end of the holder 1 has an inwardly directed annular flange 43 arrangement described, the plungers in their extreme outward movements will slightly retract the work holders and pernnt the disengageincnt oi the latter from the work, The

machine operates the same as the one here inbefore described, it being particularly noted that the expanding heads just after coming together, as in Fig. 8, initially engage the barrel blank at its middle portion and then progressively exert pressure fromsuch middle portion toward both ends, until the blank is formed into the shape of a bilged barrel, as shown in Fig. 7. After the blank has been inserted between the work holders it is held in that position by the springs ll, and even until after it has been acted upon the expanding heads. lit will be understood that these holders apply pressure to the ends of the barrel blank and keep pressing against such ends in the- :ank. in the return movement of the plungers the 'work holders will be slightly retracted against tlieiension of their springs, thereby permitting the prodnot to be removed from the machine.

The shaft 34 may be operated by any suitable driving connections, as, for instance, through the medium of the gears 45 on said shaft, pinions ,46 on driving shaft 47 having a drive gear .8 driven in any suitable I manner and adapted to be operatively connected with the drive'shaft 47 by anysuit able form of clutch, such as that indicated at '49, such clutch being provided with a shifting handle 50.

I claim: I

1. The method of forming bilged metal barrel bodies which consist in applying pressure to the interior of a blank, such pressure being applied initially substantially midway of its length to grip and hold the blank.

.2. The method of forming bilged metal barrel bodies which consists in applying to the interior of a blank outward pressure initially substantially midway of its length to grip and hold it and then progressively outwardly toward opposite ends.

3. The method of forming bilged metal barrel bodies which consists in applying to the interior ofa blank outward pressure initially substantially midway of its length to grip and hold it and then progressively outwardly toward opposite ends, and applying pressureto the ends of the blank which contract during the formation of the bilge.

4. The method of forming bilged metalbarrel bodies which consists in applying to the interior of a. cylindrical blank beginning midway of its length and working "progressively to both ends the pressure of an internal expanding die.

5. The method of forming bilged metalbarrel bodies which consists in initially gripping the interior of a cylindrical blank midway of its length by means of an internally applied expanding die and expanding the blank by pressure applied by such die progressively rom the mlddle portion outwardly to the opposite ends.

6. The method of forming bilgecl metalbarrel bodies which consists in introducing a cylindrical blank into a die having an interior form corresponding with the desired bilge of the barrel body and then forcing the blank to the form ofs'aid die by pressure applied initially to the central ortion "of the blank. and then progressive y outwardly toward opposite ends. '7. The method of forming bilged metal barrel bodies which consistsin introducing a cylindrical metal blank into a die having an interior form corresponding with the. de-

sired bilge of the barrel body and applying to the interior of the blank beginning midway of its length and working progressively t0 both the -;pressure caused by two sively from the middle pbrtion outwardly meeti ia g expalilggflefdifes. b to the opposite ends.

- 8. he met 0 orming ilged metal 7 barrel bodies which cQnsists in initially grip- LEONHARD BAUROTH- 5 ping the interior of a glindrical blank sub- Witnesses:

.stantially midway of itisllength and expand- CHAS. W. M12011,

ing the blank bypresgure applied progres- EDNA RATE. 

